2. Heath Slater

Perhaps it's unfair to refer to a multi-time tag-team champion as a jobber, but it certainly doesn't look like the WWE have any immediate plans for Heath Slater. His transition to the RAW brand following the superstar shake-up now looks like a huge mistake.
The Smackdown tag-team division badly needs Slater and Rhino back whereas the RAW division could easily do without them.
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Originally debuting as part of NXT Season One, and later part of Nexus, the future looked fairly decent for Slater. But after the dissipation of the Nexus, he was soon turned into a typical joke character, embodying everything we normally associate with a jobber.
No matter how disrespectfully a superstar is treated, it is always worth keeping an eye on them. How people react to being given bad gimmicks normally says a lot about the kind of attitude and desire they have to improve themselves. Slater has always taken what he is given and made it work.
While he was part of 3MB, you could tell that his other two team mates - one being the current WWE Champion Jinder Mahal - were not at all impressed. Slater was the only one of the three that put some effort into getting the faction over, which is perhaps why he was the only one of the three not to be released.
Heath would probably need to find a new gimmick if he were to hold the WWE Championship anytime soon. The whole 'i've got kids' thing is entertaining enough for a low-level tag team, but would probably fall flat in the main event.
He would probably work best as a transitional babyface champion, giving the fans a short-term reason to get behind a loveable underdog until a bigger, meaner heel came along to rob him of it.
He also has much better mic skills than Jinder and an ability to not take himself too seriously and make people love him for it in the process.